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https://github.com/ibm-s390-linux/s390-tools.git
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c7fe21b019
Add a function to detect the existence of the CPU Measurement Sampling Facility on a system. Add a function which extracts the CPU Measurement Sampling Facility characteristics on a system, such as - minimum sample speed - maximum sample speed - current CPU speed - basic sample size in bytes - diagnostic sample size in bytes Add a function to detect the existence of the CPU Measurement Sampling Facility on a system and return the current sampling buffer management characteristics, such as: - minimum supported sampling buffer size - maximum supported sampling buffer size Add a function to detect the existence of the CPU Measurement Counting Facility on a system. Add a function which extracts the CPU Measurement Counting Facility characteristics on a system, such as - counter first version number - counter second version number - counter set authorization level Add a function the returm the PMU type number of a CPU Measurement Facility device driver. These numbers may vary between boots. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* Copyright IBM Corp. 2022
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "lib/libcpumf.h"
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int libcpumf_cpuset(const char *parm, cpu_set_t *mask)
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{
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char *cp, *buffer = strdup(parm);
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int to, from, rc;
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if (!buffer) /* Errno set to ENOMEM */
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return -1;
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/* Check for invalid characters, such as 11.12 instead 11-12
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* but allow blanks and newline. Newline is appended
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* when the string is taken from sysfs files, for example
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* /sys/devices/system/cpu/online
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*/
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if (strspn(buffer, "0123456789-,\n ") != strlen(buffer)) {
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errno = EINVAL;
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return -1;
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}
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CPU_ZERO(mask);
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for (; (cp = strtok(buffer, ",")); buffer = NULL) {
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char *dash = strchr(cp, '-'); /* Range character? */
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bool is_ok;
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if (dash) {
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rc = sscanf(cp, "%d-%d", &from, &to);
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is_ok = rc == 2;
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} else {
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rc = sscanf(cp, "%d", &to);
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from = to;
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is_ok = rc == 1;
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}
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if (!is_ok) {
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errno = ERANGE;
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rc = -1;
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goto out;
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}
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for (; from <= to; ++from)
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CPU_SET(from, mask);
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}
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rc = 0;
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out:
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free(buffer);
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return rc;
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}
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int libcpumf_cpuset_fn(const char *filename, cpu_set_t *mask)
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{
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char *txt = NULL;
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ssize_t ret = -1;
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size_t len = 0;
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FILE *fp;
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fp = fopen(filename, "r");
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if (!fp)
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return ret;
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/* Read out file, one line expected */
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ret = getline(&txt, &len, fp);
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fclose(fp);
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if (ret > 0)
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ret = libcpumf_cpuset(txt, mask);
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free(txt);
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return ret;
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}
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